Cartons



June 1957 B. BENZON-PETERSEN 2,795,364

CARTONS Filed Oct. 5, 195:5

Bul e Bn one i s h Pam Jvklfiew dbm ATTORNEYS United States PatentCARTONS Boye Benzon-Petersen, Lund, Sweden, assignor to AktiebolagetAkerlund & Rausing, Lund, Sweden, a corporation of Sweden ApplicationOctober 5, 1953, Serial No. 384,160

Claims priority, application Sweden October 11, 1952 1 Claim. (Cl.22937) This invention relates to a carton for pulverulent and the likearticles.

The principal object of the invention is to provide a carton without anylining or internal bag therein which carton will nevertheless be air andpowder-tight.

The air and powder-tight carton according to the invention comprisesside walls, closure flaps provided at opposite ends of said side wallsand separated by cuts in the carton blank and adapted to be engaged withone another and/or to be glued together, crease lines in said cartonblank about which said flaps are foldable, and a sealing sheet which isdisposed over each open carton end formed by overturning said flaps, andwhich is glued along a peripheral marginal portion to the inner surfacesof said flaps before the latter are folded into the position in whichthey close the carton, and is characterised in that the cuts do notextend altogether up to the crease lines provided for folding the flaps,whereby some carton material is left at the inner end of each cut, whichcarton material, when the flaps are overturned and the cuts are spread,is fibered and forms a fibre tuft at the inner end of each cut, by meansof which fibre tufts the sealing sheet adheres to the carton in an airand powder-tight manner at the carton corners formed by the flaps beingfolded into the position in which they close the carton.

Further features and objects of the invention will become apparent fromthe following description, reference being had to the accompanyingdrawings illustrating a preferred embodiment of the invention. In thedrawmgs:

Fig. 1 is a plan view of the carton blank.

Fig. 2 shows on a larger scale the portion of the carton marked with aring in Fig. 1.

Fig. 3 is a perspective view of one end of the carton blank gluedtogether to form a tube and with the flaps overturned.

Fig. 4 shows on a larger scale and as viewed from v the inside of thetube the portion marked with a ring in Fig. 3.

Fig. 5 is an end view of the partly closed carton.

As appears from Fig. 1 the blank forming the carton shown as an exampleis punched in one piece and provided with crease lines. It has four sidewall panels 1 which are separated by crease lines and form the fourrectangular side walls of the carton Which is rectangular lIT CIOSSsection and has the form of a parallelepiped. At each end the carton haspanels forming closure flaps 4 and 5 situated in the prolongation of theside wall panels 1. The closure flap panels are separated from thepanels 1 by crease lines 2 and inter sese by cuts 3. In addition, thecarton as usual has a flap 16 for glueing together two opposite edges ofthe blank so that it forms a tube (Fig. 3). In the punching and creasingoperation the cuts 3 defining the flaps 4 and 5 are not made quite aslong as necessary for permitting overturning of the flaps 4 and 5 alongthe crease lines 2 to the position shown in Fig. 3, whereby some cartonmaterial 6 is left at the inner ends of said cuts. On overturning theflaps, said remaining carton material is torn whereby a fibre tuftdesignated 7 (Fig. 4) is left. This fibre tuft 7 which r ce extendssubstantially upwards from the end plane of the carton formed by theoverturned flaps, is well anchored in the carton material, therebyforming an extra-ordinarily good attachment for a sealing sheet 8 whichis described more in detail in the following. This sealing sheet 8 ispreferably made from a laminate or preferably from paper covered withwax, plastic or the like and is of such an extension that when it ismounted onand glued by means of a suitable adhesive to the flaps 4 and 5and the fibre tufts 7 formed in the cuts 3 separating the flaps fromeach other, it extends across the hollow of the carton exposed by theoverturned flaps 4 and 5. After said sealing sheet 8 has been mounted onand glued to the flaps 4 and 5 and the fibre tufts 7, which ispreferably performed when the container is erected and filled with thearticle to be kept in the carton, first flaps 4 are folded inwardly overthe sealing sheet 8 and then flaps 5 are folded inwardly over thesealing sheet 8 and the inwardly folded flaps 4 causing the portions ofsealing sheet 8 glued to the flaps 4, 5 to be folded, after which theflaps 5 are caused to engage with each other in that tongues 9 on oneflap 5 are in troduced into cuts 10 in the other flap 5. After both endsof the carton have been closed in the above described manner, thearticle packed into the carton is enclosed therein in an air andpowder-tight manner. Thanks to the fibre tufts 7 produced by the cuts 3separating the flaps 4 and 5 from each other and situated in the cornersof the finished carton the corners of the carton have also been made airand powder-tight, which has not been possible hitherto without verycomplicated carton constructions.

For opening of the carton the flaps 4 and 5 are first released from oneanother and swung aside, whereupon one or more perforations which aresuitably adapted as to their size to the contents of the carton can beprovided in the sealing sheet 8, which permits a convenient portioningout of the packed article. Said perforations can be realized in such away that the carton forms a suitable powdering device.

As already described the fiaps 4 and 5 can be adapted to engage witheach other for a complete sealing of the carton and/or they can be gluedto each other for the same purpose.

On its one side which is turned inwards in the finished condition of thecarton the blank forming the carton can be coated with wax, plastic orthe like or said blank can be formed by a suitable laminate to preventmoisture from penetrating through the walls of the carton to the articleenclosed therein.

Of course, it is possible to give the described and shown carton anyform whatever, without leaving the inventive idea.

Further modifications areconceivable within the scope of the inventiveidea such as is defined in the appendant claim.

What I claim and desire to secure by Letters Patent is:

A carton of fibrous material comprising a plurality of walls forming ahollow open ended body portion of the carton, an end closure flaphingedly connected to each wall along a crease line at the open end,each of said flaps at said crease line being substantially coextensivein width with the width of the corresponding wall of the carton, suchcrease lines lying in substantially the same plane with the adjacentends of all adjacent crease lines adjacent the corner junctions of thecarton walls, the adjacent edges of adjacent flaps at each of saidcorner junctions being torn edges located directly adja cent such cornerjunction and providing a tuft of free fibrous strands directly at eachof said corner junctions, a sealing sheet covering the open end of thehollow body portion of the carton and overlapping all corner junctionsReferences Cited in the file of this patent and all flaps, said sheetlying substantially in the plane UNITED STATES PATENTS of said creaselines and bemg sealed to said flaps and to all of said tufts when saidflaps are outfolded and lying 2107096 Wesselman 1938 in a substantiallycommon plane whereby the carton 5 2'569'851 Farrell 1951 may be sealedagainst seepage at all of said corner junc- FOREIGN PATENTS tions whensaid flaps are secured in infolded relationship 83,215 Australia Mar. 101921 over the end of said hollow body portion.

